Plasma surface hardening technologies and equipment developed for increasing the contact fatigue strength and hence service life of wheelsets have been studied. A process was developed and specialised equipment was manufactured for plasma surface hardening of wheelsets, using non-deficit plasma-forming environments. The equipment provides a hardened layer depth of 2-3 mm and a hardened path width of 25-35 min at a hardening rate of 13-2 cm/s. Hardness of the treated layer can be regulated within wide ranges (300-700 HB). The layer has a finely dispersed structure. The equipment is characterised by new capabilities for increasing the contact-fatigue strength of metal and, hence, improving the reliability and increasing the service life of wheelsets. Wear of the plasma hardened wheel necks is much lower than that of the mass produced ones (23-3 times). The plasma hardening of surfaces of the wheelset ridges was accomplished commercially using the TOPAS-4 equipment and the relevant automatic production line.
Plasma surface hardening of wheelsets
Plasmaoberflächenhärten von Radsätzen
1998
10 Seiten, 8 Bilder, 3 Quellen
Conference paper
English
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